Finding the Third Proportional to 713,508 and 978,405

Step by Step Solution

1. Step 1: Write the proportion equation
   713,508 : 978,405 = 978,405 : x
2. Step 2: Convert to fraction form
   713,508/978,405 = 978,405/x
3. Step 3: Cross multiply
   713,508x = 978,405 × 978,405
4. Step 4: Simplify right side
   713,508x = 957,276,344,025
5. Step 5: Solve for x
   x = 957,276,344,025/713,508
6. Step 6: Final answer
   x = 1,341,647.67